Chosen Solution
Hello, First please forget my English, I’m French. My problem is that my iPhone 4s doesn’t find any wifi. I’ve tried to reset the network and wifi. I opened it and saw if the antenna was connected (it was). I bought a new wifi and Bluetooth antenna and changed the old one, but it still doesn’t work. I’ve no more idea. Please, it would be kind if someone could tell me what can I do to fix my problem. I’ve never taken my iPhone in for repairs nor have I opened it before my actual wifi failure. Thanks
Another trick to try is to power off your iphone and put it in the freezer for 30 minutes to an hour. Then take it out and power it back on and see if wifi works. I had my brother do this with his iphone 4s one time and the crazy thing is it fixed his wifi issues.
Ok The freezer trick worked for me and my Iphone 4s. Wifi button was not greyed out but when turned on the wifi would search for like a second or two and find nothing. Also no wifi icon on main screen. 20 mins in the freezer at -18c brought it out and no power, connect to charger and wait for phone to start up and wifi now working again Obviously this is more of a workaround than a fix but will wait and see how long it lasts. Incidentally I too changed the wifi antenna on the top right hand side of the main board first as I thought it may have been faulty but obviously this is somthing else
My 4S also was unable to detect wifi networks. I heated my phone with a hairdryer and the wifi settings open and at a certain point networks were detected. I thought I was fixed but the next morning wifi was gone again. So I did the same thing but this time after networks were detected I did a hard reset (power and home buttons together) and this seems to have done the trick. I think that whatever heat does to reset the wifi chip, it’s probably overkill and possibly damaging to the phone to heat it beyond this point (i.e. till it shuts down). Likewise, the rapid expansion and contraction caused by heating it and putting it in the freezer seems likely to cause connection problems inside the phone, due to damaging solder joints.
Hey Jacques, I was surprised that your phone didn’t detect any wifi even after all of that. Then I found this and figured that your phone’s wifi chip might have died soon after you upgraded to iOS 7. I can only confirm this if you are using iOS 7. If that is not the case, then you should try using wifi with airplane mode on or turn of cellular data. -You aren’t the only one with this problem. Take a look at this link: http://www.iphoneincanada.ca/news/iost-b… -Hope this helped.
Heat the phone at speaker end with hairdryer till message comes up for overheating,power down,put in fridge for 15 min to cool.power up and all should work. It did for me.
There is a guide here to fix a greyed out WIFI and searching problem. Basically you have to reflow the wifi IC with a heat gun but you have to be very careful not to destroy the surrounding modules. I did it by covering everything surrounding the wifi IC with thermal grease. It worked for me
I had this problem and discovered it was a connection issue between the pad on the board and the antenna. If you have access to soldering equipment I suggest putting a small blob on the pad to raise it up and ensure a good connection to the antenna. Although the iphone doesn’t pick up as many networks as my laptop, it at least picks up the closest. Hope this helps!
